my truck (2000 f150 4x4 4,6L) is running like crap, no power and shakes really bad, i was showing two codes p0303 and p1131. i replaced the #3 coil and it ran fine for about a day and the p1131 code came back and runs like crap again. is it the o2 sensor? if so can u tell me which one is the problem so i can change it out? Thanks

 

anyone??????

 

The code states lack of heated 02 sensor up stream. Sounds like it is completely dead and the fact it runs like crap it may be shorting out or giving very incorrect data

 

ok... do you know which one is gone bad? drivers or pass side? i know its the one closest to the engine .

 

It's not that specific. Buy a new one then take a guess. Trial and error

 

It's the passenger side front oxygen sensor p1151 is the driver side code for the o2 sensor

 

ok thanks... funny thing is yesterday after running it for about 10miles the truck cleared right up and runs smooth as silk ever since. im stumped.